JP2018081260A - Display and method for manufacturing display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display that can suppress peeling of an adhesive layer between a decorative film and a polarizing plate to maintain display quality, and a method for manufacturing the display.SOLUTION: A method for manufacturing a display includes: a decorative film adhesion step of adhering a first surface of a decorative film having an opening to a light-transmissive plate for a cover; a heat treatment step of heating a display panel including a first polarizing plate adhered to a display surface; and a light-transmissive substrate for a cover adhesion step of adhering, after the heat treatment step, the light-transmissive substrate for a cover and the first polarizing plate, at a position at which a second surface on the opposite side of the first surface of the decorative film adhered in the decorative film adhesion step covers an end of the first polarizing plate.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a display device and a method for manufacturing the display device.

  Patent Document 1 describes a method of manufacturing a liquid crystal display device that can reduce stress on a glass substrate by annealing and humidification treatment and reduce display unevenness.

JP 2008-26612 A

  A display apparatus may adhere a decorating film to a transparent substrate for a cover such as glass. In this case, in the display device, the surface of the cover translucent substrate on which the decorative film is bonded is bonded to the polarizing plate of the display panel using an adhesive such as an ultraviolet curable resin. The decorative film is a colored plastic sheet and has a light shielding property. In the decorative film, for example, a portion that overlaps the display area of the display panel as viewed from the viewer side is opened, and a portion other than the display area is shielded from light. That is, the decorative film is disposed so as to cover the end portion of the polarizing plate when viewed from the observer side.

  The adhesive layer that bonds the translucent substrate for the cover and the polarizing plate may be peeled off due to shrinkage of the polarizing plate due to heat or the like. The adhesive layer at the portion where the end of the polarizing plate and the decorative film face each other becomes thinner by the thickness of the decorative film and is particularly easily peeled off.

  This invention is made | formed in view of the above, The objective is suppressing the peeling of the contact bonding layer between a decorating film and a polarizing plate, and the manufacturing method of the display apparatus which can maintain display quality, and a display apparatus It is to provide.

  In order to solve the above-described problems and achieve the object, as a first aspect of the present invention, a method for manufacturing a display device includes bonding a first surface of a decorative film having an opening to a transparent substrate for a cover. The decorative film bonding step, the heat treatment step of heating the display panel including the first polarizing plate bonded to the display surface side, and the decoration bonded in the decorative film bonding step after the heat treatment step A transparent cover for bonding the translucent substrate for cover and the first polarizing plate at a position where the second surface opposite to the first surface of the film covers an end of the first polarizing plate. And an optical substrate bonding step.

  As a second aspect of the present invention for solving the above-described problems and achieving the object, a display device includes a display panel including a first polarizing plate bonded to a display surface, a first direction, and the first direction. A first film having a first surface formed by a second direction perpendicular to the direction, a decorative film having an opening, a translucent substrate for a cover, the translucent substrate for a cover, and the first surface for bonding the first surface. 1 adhesive layer, and the 2nd adhesive layer which adhere | attaches the surface by the side of the said decoration film of the 3rd direction orthogonal to the said 1st surface of the said translucent board | substrate for covers, and the said 1st polarizing plate. The second surface, which is the surface on the first polarizing plate side in the third direction of the decorative film, covers an end portion of the first polarizing plate, and a plurality of distances from the first surface are different. The plurality of surfaces have a distance from the first surface in a direction away from the opening side of the decorative film. It is placed in short order.

  As a third aspect of the present invention for solving the above-described problems and achieving the object, a display device includes a display panel including a first polarizing plate bonded to a display surface, a first direction, and the first direction. A first film having a first surface formed by a second direction perpendicular to the direction, a decorative film having an opening, a translucent substrate for a cover, the translucent substrate for a cover, and the first surface for bonding the first surface. 1 adhesive layer, and the 2nd adhesive layer which adhere | attaches the surface by the side of the said decoration film of the 3rd direction orthogonal to the said 1st surface of the said translucent board | substrate for covers, and the said 1st polarizing plate. The second surface, which is the surface on the first polarizing plate side in the third direction of the decorative film, covers the end of the first polarizing plate, and the decorative film is on the opening side. The angle formed by the inner peripheral surface as the side surface and the first surface is an acute angle.

FIG. 1 is a schematic perspective view illustrating a display device according to the present embodiment. FIG. 2 is a schematic perspective view showing the display panel according to the present embodiment. FIG. 3 is a schematic cross-sectional view showing a BB cross section of FIG. 4 is a schematic cross-sectional view showing the A1-A2 cross section of FIG. FIG. 5 is a schematic cross-sectional view showing the position Q in FIG. 4 in an enlarged manner. FIG. 6 is a plan view of the decorative film according to the present embodiment. FIG. 7 is a schematic cross-sectional view showing a CC cross section of FIG. 6. FIG. 8 is a schematic cross-sectional view showing a state where the second adhesive layer is peeled from the inner peripheral surface of the decorative film. FIG. 9 is a schematic cross-sectional view showing a vertical cross section including the opening of the first modified example of the decorative film of the present embodiment. FIG. 10: is a cross-sectional schematic diagram which shows the vertical cross section containing the opening part of the 2nd modification of the decorating film of this embodiment. FIG. 11 is a plan view of a third modification of the decorative film of the present embodiment. FIG. 12 is a flowchart for explaining an example of the method for manufacturing the display device according to the present embodiment. FIG. 13 is an explanatory diagram for describing an example of a first modification of the heat treatment step of the present embodiment. FIG. 14 is a plan view of the weight placed on the display panel and viewed from the upper side in the vertical direction in the heat treatment step. FIG. 15 is an explanatory diagram for describing an example of a second modification of the heat treatment process of the present embodiment. FIG. 16 is an explanatory diagram for explaining an example of three modified examples of the second heat treatment step of the present embodiment. FIG. 17 is an explanatory diagram for describing an example of a fourth modification of the heat treatment step of the present embodiment. FIG. 18 is an explanatory diagram for describing an example of a fifth modification of the heat treatment step of the present embodiment. FIG. 19 is an explanatory diagram for describing an example of a sixth modification of the heat treatment step of the present embodiment. FIG. 20 is a graph showing experimental results of measuring the amount of contraction of the polarizing plate by heating the display panel after the heat treatment step.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

  FIG. 1 is a schematic perspective view illustrating a display device according to the present embodiment. In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship of each part will be described with reference to this XYZ orthogonal coordinate system. The X-axis direction (first direction) is called the width direction as one direction in the horizontal plane, and the Y-axis direction (second direction) is called the vertical direction as the direction perpendicular to the X-axis direction in the horizontal plane. The Z-axis direction (third direction) orthogonal to each of the axial directions is defined as the thickness direction. The X axis is orthogonal to the YZ plane. The Y axis is orthogonal to the XZ plane. The Z axis is orthogonal to the XY plane. The XY plane includes an X axis and a Y axis. The XZ plane includes an X axis and a Z axis. The YZ plane includes a Y axis and a Z axis. In the following description, the plan view is a viewpoint of viewing the display device 100 from the Z-axis direction. In the following description, a vertical cross section is a cross section cut along a plane parallel to the Z axis. In the following description, the vertical sectional view is a viewpoint in which the vertical cross section is viewed from a position facing the vertical cross section. In the following description, the vertical direction is a direction in which gravity is applied and coincides with the Z-axis direction. Further, in the following description, the side on which the observer who observes the display device 100 as viewed from the display device 100 is present will be described as the observer side 18. In addition, the side opposite to the observer side 18 when viewed from the display device 100 will be described as the back side 19.

  As shown in FIG. 1, the display device 100 includes a display panel 5, a housing frame 9 that houses the display panel 5, and a cover translucent substrate 30 that covers the housing frame 9. The display device 100 includes a display region 4 in which display can be confirmed by an observer from the thickness direction (Z-axis direction) of the display device 100, and a light-shielding region 3 in which light transmitted through the outer periphery of the display region 4 from the display region 4 is limited. With. A capacitance type or mechanical type switch having a wake-up function and an input / output function of the display device 100 may be disposed in a part of the light shielding region 3.

  FIG. 2 is a schematic perspective view showing the display panel according to the present embodiment. FIG. 3 is a schematic cross-sectional view showing a BB cross section of FIG. As shown in FIG. 2, the display panel 5 includes a panel 2, a second polarizing plate 6, a first polarizing plate 7, a retardation film 8, and a driver IC 11.

  As shown in FIG. 3, the panel 2 includes a pixel substrate 10 as a pair of substrates and a counter substrate 20 which are bonded to each other with a frame-shaped seal member 12 therebetween. The counter substrate 20 and the pixel substrate 10 are formed of light-transmitting glass, plastic, or the like. The seal member 12 is disposed along the outer periphery of the pixel substrate 10. The seal member 12 bonds the pixel substrate 10 and the counter substrate 20 together. Liquid crystal is sealed in a space surrounded by the pixel substrate 10, the counter substrate 20, and the seal member 12 to form a liquid crystal layer 13.

  In the panel 2, a large number of pixels contributing to display are arranged in a matrix in a region where the liquid crystal layer 13 is enclosed. A region where a large number of pixels contributing to display are arranged in a matrix form is a display surface for displaying information, and is a display region 4 shown in FIGS.

The pixel substrate 10 is a thin film transistor (TFT) as a circuit substrate.
The element is formed, and has a plurality of pixel electrodes arranged in a matrix on the surface of the pixel substrate 10 and a common electrode formed to be insulated from the pixel electrodes. On the pixel substrate 10, wiring such as a pixel signal line for supplying a pixel signal to the pixel electrode and a scanning signal line for driving each TFT element is formed via the TFT element.

  The display device 100 of the present embodiment exemplifies a liquid crystal driving method using an electric field generated in a direction parallel to the substrate (lateral direction), that is, a so-called lateral electric field, as a method for driving the liquid crystal. As a display device that drives a liquid crystal using such a lateral electric field, the display device 100 according to the present embodiment includes a lateral display such as FFS (Fringe Field Switching) and IPS (In Plane Switching). The liquid crystal driving method is not limited to the electric field display device, and a common electrode is provided on the counter substrate 20 and a vertical electric field generated between the counter substrate 20 and the pixel substrate 10, that is, a so-called vertical electric field. . The display device 100 according to the present embodiment is a display device that drives a liquid crystal using a vertical electric field, and includes TN (Twisted Nematic), VA (Vertical Alignment), and ECB (Electrically Controlled Birefringence). Refraction) or the like.

  As shown in FIG. 2, the pixel substrate 10 has a larger area in plan view than the counter substrate 20, and is bonded together with a part of the pixel substrate 10 protruding from the counter substrate 20. A driver IC 11 for driving the liquid crystal layer 13 is mounted on the projecting portion 10a which is the projecting portion.

  The second polarizing plate 6 is bonded to the pixel substrate 10 located on the back side 19 opposite to the display area 4 of the panel 2 via the retardation film 8. The first polarizing plate 7 is disposed on the counter substrate 20 side of the panel 2. More specifically, the first polarizing plate 7 is bonded to the counter substrate 20 so as to cover the display region 4. That is, the first polarizing plate 7, the panel 2, the retardation film 8, and the second polarizing plate 6 are bonded to each other through the adhesive layer. Therefore, the second polarizing plate 6, the retardation film 8, the panel 2, and the first polarizing plate 7 are laminated in this order from the back side 19 toward the observer side 18.

  The second polarizing plate 6 shown in FIG. 2 includes a polarizer and a pair of translucent protective films bonded to both surfaces of the polarizer. Similarly, the 1st polarizing plate 7 has a polarizer and a pair of protective film which has the translucency bonded on both surfaces of the polarizer. As the polarizer, for example, a uniaxially stretched film obtained by adsorbing a dichroic substance such as iodine or a dichroic dye on a polyvinyl alcohol film can be used. In the polarizer, the uniaxially stretched direction becomes the absorption axis. In the polarizer, the direction perpendicular to the uniaxially stretched direction is the transmission axis. In the present embodiment, the absorption axes of the second polarizing plate 6 and the first polarizing plate 7 coincide with the Y-axis direction. As the protective film, for example, triacetyl cellulose (TAC) is used. As the retardation film 8, for example, a birefringent film of a polymer film, an alignment film of a liquid crystal polymer, or the like can be used. A retardation film may be disposed between the first polarizing plate 7 shown in FIG. The second polarizing plate 6, the first polarizing plate 7, the retardation film 8, the protective film, and the like are called optical films. These optical films have an area larger than the display area 4 and are equal to or less than the counter substrate 20. It is an area.

  4 is a schematic cross-sectional view showing the A1-A2 cross section of FIG. FIG. 5 is a schematic cross-sectional view showing the position Q in FIG. 4 in an enlarged manner. As shown in FIGS. 4 and 5, the display device 100 bonds the display panel 5, the cover translucent substrate 30, the decorative film 32, the cover translucent substrate 30, and the decorative film 32. First adhesive layer 33 to be provided. The display device 100 bonds the second adhesive layer 34 that bonds the cover translucent substrate 30 and the first polarizing plate 7, the plate spacer 35, the first polarizing plate 7 and the counter substrate 20. A third adhesive layer 38, a backlight (illuminating device) 39 for illuminating the display panel 5, an FPC (Flexible Printed Circuit) substrate (flexible wiring substrate) 15 connected to the pixel substrate 10 of the display panel 5, A control unit 50 and a housing frame (accommodating member) 9 are provided.

  As shown in FIG. 4, the cover translucent substrate 30 is a member that transmits light. The cover translucent substrate 30 is made of glass, for example. The cover translucent substrate 30 has a plate shape, and may have a rectangular shape in plan view. In the present embodiment, the rectangle includes a rounded rectangle. That is, the four corners are not orthogonal but include a square having a curved shape. For example, it may be rectangular in plan view, or at least one of the corners may have a curvature. Further alternatively, the cover translucent substrate 30 may have a shape other than a rectangular shape in plan view. The cover translucent substrate 30 includes a back surface 30 r that is a surface facing the first polarizing plate 7. The cover translucent substrate 30 includes a front surface 30f that is a surface opposite to the back surface 30r. The cover translucent substrate 30 has a size larger than the area of the counter substrate 20 and the pixel substrate 10 so that the counter substrate 20 of the display panel 5 is bonded to the back surface 30r.

  FIG. 6 is a plan view of the decorative film according to the present embodiment. FIG. 7 is a schematic cross-sectional view showing a CC cross section of FIG. 6. As shown in FIGS. 6 and 7, the decorative film 32 includes an outer peripheral surface 40, an opening 41, an inner peripheral surface 42, an upper surface 44, a lower surface 46, and corner portions 47. The opening 41 is an area where the decorative film 32 is not provided in the Z-axis direction. In the following description, the inner periphery of the decorative film 32 refers to a periphery formed by a portion facing the opening 41 on the side wall of the decorative film 32 in plan view. Moreover, the outer periphery of the decoration film 32 refers to the periphery which the part which does not face the opening part 41 of the side wall of the decoration film 32 forms in planar view. The outer peripheral surface 40 is a side surface of the outer peripheral portion of the decorative film 32. In FIG. 6, the opening 41 has a rectangular shape in plan view. Note that the opening 41 is not limited to a rectangular shape, but may be another irregular shape such as a U-shape. As shown in FIG. 7, the inner peripheral surface 42 is a side surface of the inner peripheral portion of the decorative film 32. As shown in FIG. 5, the upper surface 44 is a surface facing the surface 30 f of the cover translucent substrate 30. The lower surface 46 is a surface facing the first polarizing plate 7. As shown in FIG. 7, the outer peripheral surface 40 is orthogonal to the upper surface 44 and the lower surface 46. As shown in FIG. 6, the corners 47 are right-angled portions located at the four corners of the inner peripheral surface 42 when the decorative film 32 is viewed in a plan view.

  As shown in FIG. 6, the decorative film 32 is a plastic sheet having a light shielding performance. The decorative film 32 has, for example, a structure in which colored plastics are laminated over a plurality of layers, and a protective layer (not shown) is laminated on the lowermost surface 46 side. The material of the colored plastic layer and the protective layer is, for example, PET. The decorative film 32 blocks light incident on the decorative film 32 from the first polarizing plate 7. As shown in FIG. 6, the decorative film 32 shields light incident on the portion other than the display region 4 from the first polarizing plate 7 in a plan view, and configures the light shielding region 3 shown in FIGS. 1 and 6. . The opening 41 of the decorative film 32 transmits light incident from the first polarizing plate 7 in plan view.

  As shown in FIG. 5, the first adhesive layer 33 bonds the upper surface 44 of the decorative film 32 and the rear surface 30 r of the cover translucent substrate 30. As shown in FIG. 7, the decorative film 32 is affixed to the protective film 36 via the first adhesive layer 33 before being attached to the cover translucent substrate 30. The protective film 36 is a plastic sheet. Thereby, it is possible to prevent dust or the like from adhering to the first adhesive layer 33. The protective film 36 is peeled from the first adhesive layer 33 when the decorative film 32 is bonded to the cover translucent substrate 30. A thickness t <b> 1 shown in FIG. 7 indicates the sum of the thickness of the decorative film 32 and the thickness of the first adhesive layer 33. In the present embodiment, the thickness t1 is 40 μm or less. Thereby, the thickness of the display device 100 can be reduced.

  As shown in FIG. 5, the second adhesive layer 34 is an ultraviolet (UV) curable resin having translucency. As shown in FIGS. 4 and 5, the second adhesive layer 34 bonds the first polarizing plate 7 to at least a part of the back surface 30 r of the cover translucent substrate 30 and the lower surface 46 of the decorative film 32. . The lower surface 46 of the decorative film 32 is disposed at a position that covers the end of the first polarizing plate 7 in a plan view as viewed from the viewer side 18. The second adhesive layer 34 may be a thermosetting adhesive, an ultraviolet / thermosetting combined adhesive, and an optical adhesive film (OCA: Optical Clear Adhesive).

  The plate-like spacer 35 is a rectangular plate-like member. The plate spacer 35 is bonded to the lower surface 46 of the decorative film 32. The plate-like spacer 35 is formed of a translucent material such as polyethylene terephthalate. The plate-like spacer 35 is disposed at a position overlapping the driver IC 11 on the pixel substrate 10 in plan view. The width of the plate spacer 35 in the X-axis direction is equal to or smaller than the width of the pixel substrate 10 and is equal to or larger than the width of the driver IC 11 in the X-axis direction. The length of the plate spacer 35 in the Y-axis direction is preferably larger than the length of the driver IC 11 in the Y-axis direction. Thereby, the mounting error of the plate-like spacer 35 to the cover translucent substrate 30 is absorbed, and the plate-like spacer 35 is easily disposed at a position that overlaps the driver IC 11 on the pixel substrate 10 in plan view.

  As shown in FIG. 5, the third adhesive layer 38 bonds the first polarizing plate 7 and the counter substrate 20. The third adhesive layer 38 has an inclined side surface in the Y-axis direction. This is formed as the first polarizing plate 7 contracts due to the heat treatment when the display device 100 is manufactured.

  The backlight (illuminating device) 39 includes an LED (light source) that emits light and a light guide plate, and can irradiate the backlight toward the pixel substrate 10. The backlight (illuminating device) 39 and the pixel substrate 10 of the display panel 5 are bonded to each other through an adhesive tape, for example.

  The FPC substrate 15 has an inner surface (first surface) on one end portion side that is the cover light-transmitting substrate 30 side of the pixel substrate 10 and is electrically connected to the terminal of the overhanging portion 10a by an ACF (conductive adhesive). And glued. The other end of the FPC board 15 is electrically connected to the control unit 50. At one end of the FPC board 15, a wiring (not shown) that is conductively connected to the input terminal disposed on the overhanging portion 10a is formed.

  As shown in FIG. 2, for example, a driver IC 11 serving as a drive circuit necessary for driving the pixel substrate 10 is formed on one surface on the overhanging portion 10 a. The driver IC 11 is connected to an external power source and various external devices.

  The control unit 50 is electrically connected to the driver IC 11 via the FPC board 15. The control unit 50 supplies a drive signal and power to the pixel substrate 10 via the FPC substrate 15 and the driver IC 11. The control unit 50 is electrically connected to a sensor pattern (not shown) for measuring a change in capacitance formed on the transparent substrate for cover 30 and the backlight 39 via the FPC board 15 and the driver IC 11. The The controller 50 can detect an external proximity object by a change in capacitance obtained from a sensor pattern (not shown). The control unit 50 can adjust the luminance of the display area 4 by controlling the backlight 39. The control unit 50 includes a power source such as a secondary battery.

  The housing frame 9 includes an internal frame 9 </ b> F that shields the control unit 50 and the backlight (illumination device) 39. As shown in FIGS. 1 and 4, the housing frame 9 is closed by the cover translucent substrate 30 on the viewer side 18. The housing frame 9 accommodates components other than the light-transmitting substrate 30 for cover among the components of the display device 100 described above.

  FIG. 8 is a schematic cross-sectional view illustrating a state where the second adhesive layer is peeled from the inner peripheral surface of the decorative film according to the comparative example. Unlike the display device 100 according to the first embodiment, the comparative example illustrated in FIG. 8 illustrates an example in which the sum of the thickness of the decorative film 32 and the thickness of the first adhesive layer 33 exceeds 40 μm. With reference to FIG. 8, a mode that the 2nd contact bonding layer 34 which concerns on a comparative example peels from the internal peripheral surface of a decorating film is demonstrated. The first polarizing plate 7 is uniaxially stretched in the absorption axis direction. For this reason, residual stress is generated inside the first polarizing plate 7. As a result, when the display device 100 is placed in a high temperature environment, the first polarizing plate 7 rises in temperature to reduce residual stress and contract. The first polarizing plate 7 has a larger amount of shrinkage in the absorption axis direction than in the transmission axis direction. The case where the display device 100 is placed in a high temperature environment includes, for example, a case where the display device 100 is exposed to direct sunlight or a case where the display device 100 is heated by internal power consumption.

  Since the lower surface 46 of the decorative film 32 is disposed at a position covering the end of the first polarizing plate 7, the distance between the end of the first polarizing plate 7 and the decorative film 32 is the first polarization. The distance between the portion other than the end portion of the plate 7 and the cover translucent substrate 30 is shorter. Furthermore, the sum of the thickness of the decorative film 32 and the thickness of the first adhesive layer 33 exceeds 40 μm. That is, the distance between the lower surface 46 and the first polarizing plate 7 is shorter in the comparative example than in the first embodiment. With such a structure, when the first polarizing plate 7 is thermally contracted in the direction of the arrow 52 shown in FIG. 8, the direction of the arrow 52 with respect to the second adhesive layer 34 near the lower surface 46 covering the first polarizing plate 7. The power of is added locally. As a result, the second adhesive layer 34 is peeled off from the inner peripheral surface 42 orthogonal to the lower surface 46 and the arrow 52 to generate bubbles 48 and 49.

  The bubble 48 is generated between the display area 4 of the display device 100 and the observer. Thereby, the bubble 48 interferes with information displayed on the display area 4 of the display device 100. As a result, the display quality of the display device 100 decreases.

  As shown in FIG. 5, in the display device 100 according to this embodiment, the thickness t <b> 1 that is the sum of the thickness of the decorative film 32 and the thickness of the first adhesive layer 33 is 40 μm or less. With such a configuration, a sufficient distance between the lower surface 46 of the decorative film 32 and the first polarizing plate 7 can be secured. Thereby, even when the first polarizing plate 7 contracts and an external force is applied to pull the second adhesive layer 34 near the inner peripheral surface 42 in the contracting direction, the second adhesive layer 34 near the inner peripheral surface 42 contracts. External force pulling in the direction can be dispersed. As a result, the external force that pulls the second adhesive layer 34 in the contraction direction can be prevented from being locally applied in the vicinity of the inner peripheral surface 42, and the second adhesive layer 34 can be prevented from peeling in the vicinity of the inner peripheral surface 42. The display quality of the display device 100 can be maintained for a long time.

(First modification)
FIG. 9 is a schematic cross-sectional view showing a vertical cross section including the opening of the first modified example of the decorative film of the present embodiment. With reference to FIG. 9, the decorative film 32a of the 1st modification of this embodiment is demonstrated. As shown in FIG. 9, the decorative film 32 a has the same configuration as the decorative film 32 except that the decorative film 32 a includes an inner peripheral surface 42 a and a lower surface 46 a instead of the inner peripheral surface 42 and the lower surface 46.

  The inner peripheral surface 42a includes a first inner peripheral surface 421a, a second inner peripheral surface 422a, and a third inner peripheral surface 423a. The first inner peripheral surface 421a, the second inner peripheral surface 422a, and the third inner peripheral surface 423a are inner surfaces on the opening 41 side of the decorative film 32a. The first inner peripheral surface 421a, the second inner peripheral surface 422a, and the third inner peripheral surface 423a are arranged from the upper surface 44 side toward the lower surface 46a side, the first inner peripheral surface 421a, the second inner peripheral surface 422a, and the third inner surface. It arrange | positions in order of the surrounding surface 423a. A width w1 illustrated in FIG. 9 is a distance between the first inner peripheral surface 421a and the outer peripheral surface 40. A width w2 shown in FIG. 9 is a distance between the second inner peripheral surface 422a and the outer peripheral surface 40. A width w <b> 3 illustrated in FIG. 9 is a distance between the third inner peripheral surface 423 a and the outer peripheral surface 40. The width w1 is longer than the width w2. The width w2 is longer than the width w3. That is, the first inner peripheral surface 421a, the second inner peripheral surface 422a, and the third inner peripheral surface 423a are arranged from the upper surface 44 side to the lower surface 46a side in order of increasing distance from the outer peripheral surface 40.

  In the decorative film 32a, the lower surface 46a includes a first lower surface 461a, a second lower surface 462a, and a third lower surface 463a. The first lower surface 461a, the second lower surface 462a, and the third lower surface 463a are arranged in order of the first lower surface 461a, the second lower surface 462a, and the third lower surface 463a from the inner peripheral surface 42a side to the outer peripheral surface 40 side. A distance d1 illustrated in FIG. 9 is a distance between the first lower surface 461a and the upper surface 44. A distance d2 illustrated in FIG. 9 is a distance between the second lower surface 462a and the upper surface 44. A distance d3 illustrated in FIG. 9 is a distance between the third lower surface 463a and the upper surface 44. The distance d1 is longer than the distance d2. The distance d2 is longer than the distance d3. That is, the first lower surface 461a, the second lower surface 462a, and the third lower surface 463a are arranged from the opening 41 side to the outer peripheral surface 40 side in order of decreasing distance from the upper surface 44, and form three steps in a vertical sectional view. To do. In other words, the first lower surface 461a, the second lower surface 462a, and the third lower surface 463a are arranged in order of decreasing distance from the upper surface in a direction away from the opening 41 side. The thickness t2 shown in FIG. 9 is the sum of the distance d1 from the first lower surface 461a to the upper surface 44 and the thickness of the first adhesive layer 33. The thickness t2 is 40 μm or less.

  As described above, in the decorative film 32a, the first lower surface 461a, the second lower surface 462a, and the third lower surface 463a form steps, and the thickness t3 is 40 μm or less. With such a configuration, the display device 100 can sufficiently secure the distance between the lower surface 46a of the decorative film 32a and the first polarizing plate 7, and the lower surface 46a forms a step so that the lower surface 46a. And the first polarizing plate 7 can be made closer in steps. Thereby, even when the first polarizing plate 7 contracts and an external force is applied to pull the second adhesive layer 34 near the inner peripheral surface 42a in the contracting direction, the second adhesive layer 34 near the inner peripheral surface 42a contracts. External force pulling in the direction can be dispersed. As a result, an external force that pulls the second adhesive layer 34 in the contraction direction can be prevented from being locally applied in the vicinity of the inner peripheral surface 42a, and the second adhesive layer 34 can be prevented from peeling in the vicinity of the inner peripheral surface 42a. The display quality of the display device 100 can be maintained for a long time.

  The portion where the step is formed may be, for example, only the portion parallel to the Y-axis direction or the portion parallel to the X-axis direction in the inner peripheral surface 42a. In this case, it is preferable that a step is formed in a portion of the inner peripheral surface 42 a that is orthogonal to the absorption axis direction of the first polarizing plate 7. In the present embodiment, since the absorption axis of the first polarizing plate 7 coincides with the Y-axis direction, the step is preferably formed in a portion of the inner peripheral surface 42a that is parallel to the X-axis direction. In this case, a portion of the inner peripheral surface 42 a that is parallel to the Y-axis direction is orthogonal to the upper surface 44. Thereby, when the first polarizing plate 7 is greatly contracted in the absorption axis direction due to heat, a portion to which an external force that pulls the second adhesive layer 34 in the contraction direction is applied most (a portion orthogonal to the absorption axis of the inner peripheral surface 42a). Steps can be formed, and the force pulling the second adhesive layer 34 in the vicinity of the inner peripheral surface 42a in the shrinking direction can be effectively dispersed.

  The inner circumferential surface 42a includes the first inner circumferential surface 421a, the second inner circumferential surface 422a, and the third inner circumferential surface 423a. For example, the inner circumferential surface 42a may have a configuration excluding the third inner circumferential surface 423a. The fourth inner peripheral surface may be configured to have a shorter distance from the outer peripheral surface 40 than the third inner peripheral surface 423a.

  The lower surface 46a includes the first lower surface 461a, the second lower surface 462a, and the third lower surface 463a. However, the lower surface 46a may have a configuration excluding the third lower surface 463a, and further, from the upper surface 44 rather than the third lower surface 463a. It is good also as a structure provided with a 4th lower surface with long distance.

(Second modification)
FIG. 10: is a cross-sectional schematic diagram which shows the vertical cross section containing the opening part of the 2nd modification of the decorating film of this embodiment. With reference to FIG. 10, the decorative film 32b of the 2nd modification of this embodiment is demonstrated. As shown in FIG. 10, the decorative film 32 b has the same configuration as the decorative film 32 except that the decorative film 32 b includes an inner peripheral surface 42 b instead of the inner peripheral surface 42.

  The inner peripheral surface 42b is a side surface on the opening 41 side of the decorative film 32b. In a vertical sectional view including the opening 41, the angle formed by the inner peripheral surface 42b and the upper surface 44 is α degrees. α degree is an acute angle. The thickness t4 shown in FIG. 10 is the sum of the thickness of the decorative film 32b and the thickness of the first adhesive layer 33. The thickness t4 is 40 μm or less.

  As described above, in the decorative film 32b, the angle formed by the inner peripheral surface 42b and the upper surface 44 is an acute angle, and the thickness t4 is 40 μm or less. With such a configuration, the display device 100 can secure a sufficient distance between the lower surface 46 of the decorative film 32 b and the first polarizing plate 7, and the inner peripheral surface 42 b and the first polarizing plate 7. The distance between and can be reduced little by little. Thereby, even when the first polarizing plate 7 contracts and an external force is applied to pull the second adhesive layer 34 near the inner peripheral surface 42b in the contracting direction, the second adhesive layer 34 near the inner peripheral surface 42b contracts. External force pulling in the direction can be dispersed. As a result, an external force that pulls the second adhesive layer 34 in the contraction direction can be prevented from being locally applied in the vicinity of the inner peripheral surface 42b, and the second adhesive layer 34 can be prevented from peeling in the vicinity of the inner peripheral surface 42b. The display quality of the display device 100 can be maintained for a long time.

  The portion where the angle formed by the inner peripheral surface 42b and the upper surface 44 is an acute angle may be, for example, only a portion parallel to the Y-axis direction or a portion parallel to the X-axis direction in the inner peripheral surface 42b. In this case, it is preferable that a step is formed in a portion orthogonal to the absorption axis direction of the first polarizing plate 7 in the inner peripheral surface 42b. In the present embodiment, since the absorption axis of the first polarizing plate 7 coincides with the Y-axis direction, the portion where the angle formed by the inner peripheral surface 42b and the upper surface 44 is an acute angle is the X-axis of the inner peripheral surface 42b. It is preferably formed in a portion parallel to the direction. In this case, a portion of the inner peripheral surface 42 b that is parallel to the Y-axis direction is orthogonal to the upper surface 44. Thereby, when the polarizing plate is greatly contracted in the absorption axis direction due to heat, the acute angle portion described above is applied to a portion (a portion orthogonal to the absorption axis of the inner peripheral surface 42b) to which the pulling force is applied most in the inner peripheral surface 42b. The force pulling the second adhesive layer 34 in the vicinity of the inner peripheral surface 42b in the shrinking direction can be effectively dispersed.

(Third Modification)
FIG. 11 is a plan view of a third modification of the decorative film of the present embodiment. With reference to FIG. 11, the decoration film 32c of the 3rd modification of this embodiment is demonstrated. As shown in FIG. 11, the decorative film 32 c has the same configuration as the decorative film 32 except that the decorative film 32 c includes a corner 47 c instead of the corner 47.

  As shown in FIG. 11, the corner portions 47 c are portions located at the four corners of the inner peripheral surface 42. The corner 47c is a curved surface having a curvature radius R. The curvature radius R is, for example, 0.1 mm. According to this, even when the first polarizing plate 7 contracts and an external force is applied to pull the second adhesive layer 34 in the vicinity of the inner peripheral surface 42 in the contracting direction, the second adhesive layer 34 in the vicinity of the corner 47c is applied. The external force pulling in the shrinking direction can be dispersed. Thereby, it can suppress that the external force which pulls the 2nd contact bonding layer 34 to a contraction direction applies locally to the corner part 47c vicinity. As a result, it is possible to suppress the second adhesive layer 34 from being peeled in the vicinity of the corner 47c, and to maintain the display quality of the display device 100 for a long period of time.

(Production method)
FIG. 12 is a flowchart for explaining an example of the method for manufacturing the display device according to the present embodiment. With reference to FIG. 12, an example of a manufacturing method of the display device 100 according to the present embodiment will be described.

  As shown in FIG. 12, an example of the manufacturing method of the display device 100 according to the present embodiment includes a decorative film adhesion step S1, a heat treatment step S2, and a cover translucent substrate adhesion step S3.

  In the decorative film bonding step S <b> 1, first, the upper surface 44 of the decorative film 32 is bonded to the rear surface 30 r of the cover translucent substrate 30 via the first adhesive layer 33.

  In the heat treatment step S2, first, the display panel 5 is placed on the flat surface 60S with the second polarizing plate 6 facing downward in the vertical direction. Note that the first polarizing plate 7 may be placed facing downward in the vertical direction. The flat surface 60S is, for example, the upper surface of the mounting table 60 disposed inside the heating device. The flat surface 60S is a flat surface orthogonal to the vertical direction. For example, an electric oven is used as the heating device. The interior of the electric oven is controlled at a predetermined temperature. The predetermined temperature is a temperature at which the display panel 5 can be used and the polarizing plate sufficiently shrinks. The predetermined temperature is, for example, 85 ° C., but is not limited thereto. The predetermined temperature is preferably 110 ° C. or lower, and more preferably 100 ° C. or lower. Next, the display panel 5 is placed in an electric oven for a predetermined time and heated. The predetermined time is, for example, 20 hours. After a predetermined time has elapsed, the display panel 5 is removed from the electric oven. In addition, the order which implements decorating film adhesion process S1 and heat processing process S2 is not specifically limited, You may perform simultaneously.

  In the cover translucent substrate bonding step S3, first, the display panel 5 is placed on a flat surface with the first polarizing plate 7 facing upward. Next, an appropriate amount of a photocurable resin is potted on the first polarizing plate 7. Potting is performed by a dispenser, for example. Next, the cover translucent substrate 30 is made to face the first polarizing plate 7, and the lower surface 46 of the decorative film 32 covers the end of the first polarizing plate 7. The conductive substrate 30 is placed on the first polarizing plate 7. Next, the second adhesive layer 34 is formed by irradiating ultraviolet rays from the surface 30f side of the cover translucent substrate 30 to cure the ultraviolet curable resin.

  In the method for manufacturing the display device 100 according to the present embodiment, the heat treatment step S2 is performed before the cover translucent substrate bonding step S3. By such a process, the first polarizing plate 7 of the display panel 5 can be shrunk by heat before the first polarizing plate 7 of the display panel 5 is bonded to the transparent substrate 30 for cover. Thereby, even when the display device 100 is placed in a high temperature environment, the amount of heat shrinkage of the first polarizing plate 7 can be suppressed. As a result, the external force that pulls the second adhesive layer 34 in the vicinity of the inner peripheral surface 42 due to the contraction of the first polarizing plate 7 in the contraction direction can be suppressed, and the second adhesive layer 34 is in the vicinity of the inner peripheral surface 42. Peeling can be suppressed and the display quality of the display device 100 can be maintained for a long time.

(First Modification of Manufacturing Method)
FIG. 13 is an explanatory diagram for describing an example of a first modification of the heat treatment step of the present embodiment. FIG. 14 is a plan view of the weight placed on the display panel in the heat treatment process as viewed from the upper side in the vertical direction (Z-axis direction). In the heat treatment step S2, a plate member 62 may be placed on the upper surface of the display panel 5 (see FIG. 13). The plate member 62 is, for example, a metal plate made of SUS and having a thickness of 5 mm, but is not limited thereto. The plate member 62 may be a material that does not deform at a predetermined temperature and has a predetermined mass. The predetermined mass is a mass that does not mechanically damage the display panel 5 when placed on the upper surface of the display panel 5. The plate member 62 has flat upper and lower surfaces. As shown in FIG. 14, the plate member 62 is larger than the first polarizing plate 7 in plan view. The plate member 62 covers the first polarizing plate 7 in plan view. According to this, the flat surface 60S can be used as a fixed surface of the display panel 5, and the plate member 62 can push the upper surface of the display panel 5 downward in the vertical direction with equal pressure, and the flat surface 60S can evenly press the lower surface of the display panel 5. It can be pushed vertically upward with a certain pressure. In this manner, an external force in a direction in which the first polarizing plate 7 and the second polarizing plate 6 approach each other is applied to both surfaces of the display panel 5.

  According to this, the stress in the absorption axis direction remaining on the first polarizing plate 7 and the second polarizing plate 6 can be sufficiently removed. Thereby, even after performing heat treatment process S2 to the display panel 5, it can suppress that the 1st polarizing plate 7 and the 2nd polarizing plate 6 heat-shrink.

  By such a process, the display panel 5 can be heated in a state where an external force is applied to push the upper surface of the display panel 5 and the lower surface of the display panel 5 toward each other. Thereby, even when the display panel 5 is heated and the first polarizing plate 7 and the second polarizing plate 6 contract, it is possible to suppress the display panel 5 from being deformed in the out-of-plane direction. As a result, problems such as liquid crystal leakage and display unevenness due to deformation of the display panel 5 can be suppressed, and the display quality of the display device 100 can be maintained.

  In the heat treatment step S2, the gravity of the plate member 62 pushes the upper surface of the display panel 5 downward in the vertical direction, and the reaction force of the gravity of the plate member 62 and the display panel 5 pushes the lower surface of the display panel 5 upward in the vertical direction. However, it is not limited to this. The external force applied to both surfaces of the display panel 5 should just be applied in the direction in which the 1st polarizing plate 7 and the 2nd polarizing plate 6 approach. The external force may be applied, for example, by sandwiching the upper and lower surfaces of the display panel 5 with a vise without placing the display panel 5 on a flat surface.

(Second Modification of Manufacturing Method)
FIG. 15 is an explanatory diagram for describing an example of a second modification of the heat treatment process of the present embodiment. With reference to FIG. 15, the heat treatment step S <b> 2 of the second modified example of the present embodiment will be described. As shown in FIG. 15, in the heat treatment step S <b> 2 of the second modified example, the display device 100 of the present embodiment except that a protective film 64 is provided on the first polarizing plate 7 and the second polarizing plate 6. This is the same as the heat treatment step S2 of the manufacturing method. The protective film 64 is, for example, a plastic sheet. The protective film 64 is bonded to the first polarizing plate 7 and the second polarizing plate 6 through an adhesive layer (not shown).

  With such a configuration, when the plate member 62 is placed on the upper surface of the display panel 5, the protective film 64 can be interposed between the first polarizing plate 7 and the plate member 62. It is possible to prevent the plate 7 and the plate member 62 from coming into direct contact. Thereby, it can prevent that the 1st polarizing plate 7 is rubbed with the plate member 62, and receives a mechanical damage. As a result, display unevenness and display failure due to mechanical damage of the first polarizing plate 7 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed. Moreover, it can prevent that the 1st polarizing plate 7 becomes dirty because the protective film 64 covers the 1st polarizing plate 7.

  In addition, when the second polarizing plate 6 is placed on the flat surface 60S, a protective film 64 can be interposed between the second polarizing plate 6 and the flat surface 60S. And the flat surface 60S can be prevented from coming into direct contact. Thereby, it can prevent that the 2nd polarizing plate 6 rubs with the flat surface 60S, and receives a mechanical damage. As a result, display unevenness, display failure, and the like due to mechanical damage of the second polarizing plate 6 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed. Moreover, it can prevent that the 2nd polarizing plate 6 becomes dirty because the protective film 64 covers the 2nd polarizing plate 6. FIG.

(Third Modification of Manufacturing Method)
FIG. 16 is an explanatory diagram for describing an example of a third modification of the heat treatment step of the present embodiment. With reference to FIG. 16, the heat treatment step S2 of the third modified example of the present embodiment will be described. As shown in FIG. 16, in the heat treatment step S <b> 2 of the third modified example, three display panels 5 are stacked in the vertical direction, and the plate member 62 is placed on the upper surface of the display panel 5 positioned on the uppermost vertical direction. Except for this, it is the same as the heat treatment step S2 of the method for manufacturing the display device 100 of the present embodiment. The heat treatment step S2 of the third modification has the same effect as the method for manufacturing the display device 100 according to the present embodiment. The number of display panels 5 stacked in the vertical direction is not limited to three.

(Fourth Modification of Manufacturing Method)
FIG. 17 is an explanatory diagram for describing an example of a fourth modification of the heat treatment step of the present embodiment. With reference to FIG. 17, the heat treatment step S2 of the fourth modified example of the present embodiment will be described. As shown in FIG. 17, in the heat treatment step S2 of the fourth modified example, three display panels 5 are stacked in the vertical direction, and the plate member 62 is placed on the upper surface of the display panel 5 positioned on the uppermost vertical direction. Except that each of the first polarizing plate 7 and the second polarizing plate 6 is provided with a protective film 64, it is the same as the heat treatment step S2 of the manufacturing method of the display device 100 of the present embodiment.

  With such a configuration, when the plate member 62 is placed on the upper surface of the display panel 5, the protective film 64 can be interposed between the first polarizing plate 7 and the plate member 62. It is possible to prevent the plate 7 and the plate member 62 from coming into direct contact. Thereby, it can prevent that the 1st polarizing plate 7 is rubbed with the plate member 62, and receives a mechanical damage. As a result, display unevenness and display failure due to mechanical damage of the first polarizing plate 7 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed.

  In addition, when the second polarizing plate 6 is placed on the flat surface 60S, a protective film 64 can be interposed between the second polarizing plate 6 and the flat surface 60S. And the flat surface 60S can be prevented from coming into direct contact. Thereby, it can prevent that the 2nd polarizing plate 6 rubs with the flat surface 60S, and receives a mechanical damage. As a result, display unevenness, display failure, and the like due to mechanical damage of the second polarizing plate 6 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed.

  Further, when the second polarizing plate 6 is placed on the first polarizing plate 7, a protective film 64 can be interposed between the second polarizing plate 6 and the first polarizing plate 7, It can prevent that the 2nd polarizing plate 6 and the 1st polarizing plate 7 contact directly. Thereby, it can prevent that the 2nd polarizing plate 6 is rubbed with the 1st polarizing plate 7, and receives a mechanical damage. As a result, display unevenness and display failure due to mechanical damage of the second polarizing plate 6 and the first polarizing plate 7 can be suppressed, and deterioration of display quality of the display device 100 can be suppressed. it can.

(Fifth Modification of Manufacturing Method)
FIG. 18 is an explanatory diagram for describing an example of a fifth modification of the heat treatment step of the present embodiment. With reference to FIG. 18, the heat treatment step S <b> 2 of the fifth modified example of the present embodiment will be described. As shown in FIG. 18, the heat treatment step S <b> 2 of the fifth modification example is the same as the heat treatment step S <b> 2 of the third modification example of the present embodiment, except that the plate member 62 is disposed between the display panels 5. is there. The heat treatment step S2 of the fifth modified example has the same effect as the method for manufacturing the display device 100 according to the present embodiment.

(Sixth Modification of Manufacturing Method)
FIG. 19 is an explanatory diagram for describing an example of a sixth modification of the heat treatment step of the present embodiment. With reference to FIG. 19, the heat treatment step S <b> 2 of the sixth modified example of the present embodiment will be described. As shown in FIG. 19, the heat treatment step S <b> 2 of the sixth modified example is the fifth embodiment of the present embodiment except that a protective film 64 is provided on each of the first polarizing plate 7 and the second polarizing plate 6. This is the same as the heat treatment step S2 of the modified example.

  With such a configuration, when the plate member 62 is placed on the upper surface of the display panel 5, the protective film 64 can be interposed between the first polarizing plate 7 and the plate member 62. It is possible to prevent the plate 7 and the plate member 62 from coming into direct contact. Thereby, it can prevent that the 1st polarizing plate 7 is rubbed with the plate member 62, and receives a mechanical damage. As a result, display unevenness and display failure due to mechanical damage of the first polarizing plate 7 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed.

  In addition, when the second polarizing plate 6 is placed on the flat surface 60S, a protective film 64 can be interposed between the second polarizing plate 6 and the flat surface 60S. And the flat surface 60S can be prevented from coming into direct contact. Thereby, it can prevent that the 2nd polarizing plate 6 rubs with the flat surface 60S, and receives a mechanical damage. As a result, display unevenness, display failure, and the like due to mechanical damage of the second polarizing plate 6 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed.

  Further, when the second polarizing plate 6 is placed on the plate member 62, a protective film 64 can be interposed between the second polarizing plate 6 and the plate member 62, so that the second polarizing plate It can prevent that the board 6 and the board member 62 contact directly. Thereby, it can prevent that the 2nd polarizing plate 6 is rubbed with the plate member 62, and receives a mechanical damage. As a result, display unevenness, display failure, and the like due to mechanical damage of the second polarizing plate 6 can be suppressed, and deterioration in display quality of the display device 100 can be suppressed.

  In each of the heat treatment steps S2 described above, the display panel 5 is placed so that the first polarizing plate 7 is on the upper side in the vertical direction, but the display panel 5 is on the lower side in the vertical direction. May be placed.

(Evaluation of shrinkage due to heating)
Next, it was confirmed by experiments that the thermal contraction of the first polarizing plate 7 can be suppressed by applying the method for manufacturing the display device 100 according to the present embodiment. FIG. 20 is a graph showing experimental results of measuring the amount of contraction of the polarizing plate by heating the display panel after the heat treatment step. This experiment was performed by arranging the display panel 5 after the heat treatment step S2 and the display panel 5 not subjected to the heat treatment in an electric furnace maintained at 85 ° C.

  The vertical axis in FIG. 20 indicates the contraction amount of the first polarizing plate 7. The horizontal axis of FIG. 20 shows the elapsed time since the heat treatment was started. In FIG. 20, Evaluation Example 1 shows a change in the amount of contraction of the first polarizing plate 7 of the display panel 5 that has not been subjected to the heat treatment step S2. In FIG. 20, Evaluation Example 2 shows a change in the amount of contraction of the first polarizing plate 7 of the display panel 5 subjected to the heat treatment step S2. Evaluation Examples 1 and 2 have the same configuration as the display panel 5 shown in FIG.

  In Evaluation Example 1, the amount of shrinkage was about 200 μm larger than that in Evaluation Example 2 in 20 hours after the introduction. Evaluation Example 1 and Evaluation Example 2 continued to shrink at substantially the same rate even when the charging time exceeded 20 hours. As described above, Evaluation Example 2 was able to suppress the amount of contraction of the polarizing plate of the first polarizing plate 7 as compared with Evaluation Example 1. That is, it was shown that the thermal contraction of the first polarizing plate 7 of the display device 100 can be suppressed by performing the heat treatment step S2 on the display panel 5.

  Moreover, this inventor heated the display apparatus 100 which has the display panel 5 of the evaluation example 2 at 85 degreeC for 500 hours. As a result, it was confirmed that the bubbles 48 shown in FIG. 8 were not generated in the second adhesive layer 34.

  The display device 100 according to the present embodiment has been described by exemplifying a liquid crystal display device, but is not limited thereto. The display device 100 can also be applied to other display devices such as an organic EL display.

  In addition, the embodiment is not limited by the above-described content. The constituent elements of the above-described embodiment include those that can be easily conceived by those skilled in the art, those that are substantially the same, and those that are so-called equivalent ranges. Furthermore, various omissions, substitutions, and changes of the constituent elements can be made without departing from the spirit of the above-described embodiment.

  In addition, the present invention can take the following configurations.

(1)
A decorative film adhering step for adhering the first surface of the decorative film having an opening to the translucent substrate for the cover;
A heat treatment step of heating the display panel including the first polarizing plate bonded to the display surface side;
After the heat treatment step, the second surface opposite to the first surface of the decorative film, which is bonded in the decorative film bonding step, covers the end of the first polarizing plate, A method for manufacturing a display device, comprising: a cover translucent substrate bonding step of bonding a cover translucent substrate and the first polarizing plate.
(2)
The display panel includes a second polarizing plate bonded to a back side opposite to the display surface side,
The heat treatment step is performed in a state where an external force is applied to push the display surface side surface of the first polarizing plate of the display panel and the back surface side of the second polarizing plate toward each other. The method for manufacturing the display device according to (1).
(3)
The display according to (2), wherein the heat treatment step places the display panel on a flat surface and applies the external force by placing a plate member so as to cover the display surface of the display panel. Device manufacturing method.
(4)
The heat treatment step is performed in a state where a protective film is provided on each of the display surface side surface of the first polarizing plate and the back surface side surface of the second polarizing plate, (2) or The manufacturing method of the display apparatus as described in (3).
(5)
In the heat treatment step, a plurality of the display panels arranged in a vertical direction, which is a direction in which gravity is applied, are placed on a flat surface, and a plate member is covered on the display surface of the display panel positioned on the uppermost side. The manufacturing method of the display device according to (2), wherein the external force is applied to the plurality of display panels by being placed in this manner.
(6)
In the heat treatment step, a plurality of the display panels arranged in a vertical direction, which is a direction in which gravity is applied, are placed on a flat surface, and a plate member is placed so as to cover the display surface of each display panel. The manufacturing method of the display device according to (2), wherein the external force is applied to the plurality of display panels by placing the external force.
(7)
The heat treatment step is performed in a state in which a protective film is provided on each of the display surface side surfaces of the plurality of first polarizing plates and the back surface side of the plurality of second polarizing plates. The method for manufacturing a display device according to (5) or (6).
(8)
A display panel comprising a first polarizing plate bonded to the display surface side;
A decorative film having a first surface formed by a first direction and a second direction orthogonal to the first direction, and having an opening;
A translucent substrate for the cover;
A first adhesive layer that bonds the translucent substrate for cover and the first surface;
A second adhesive layer that bonds the surface of the decorative film side in the third direction orthogonal to the first surface of the transparent substrate for cover and the first polarizing plate;
The second surface, which is the surface on the first polarizing plate side in the third direction of the decorative film, covers the end portion of the first polarizing plate, and a plurality of surfaces having different distances from the first surface Have
The said several surface is a display apparatus arrange | positioned in order with a short distance with a said 1st surface toward the direction which leaves | separates from the said opening part side of the said decorative film.
(9)
The display device according to (8), wherein a sum of a distance from the surface arranged closest to the opening to the first surface and a thickness of the first adhesive layer is 40 μm or less.
(10)
A display panel comprising a first polarizing plate bonded to the display surface side;
A decorative film having a first surface formed by a first direction and a second direction orthogonal to the first direction, and having an opening;
A translucent substrate for the cover;
A first adhesive layer that bonds the translucent substrate for cover and the first surface;
A second adhesive layer that bonds the surface of the decorative film side in the third direction orthogonal to the first surface of the transparent substrate for cover and the first polarizing plate;
The second surface which is the surface on the first polarizing plate side in the third direction of the decorative film covers an end of the first polarizing plate,
The said decorative film is a display apparatus whose angle which the internal peripheral surface which is the side surface by the side of the said opening part and the said 1st surface make is an acute angle.
(11)
The sum of the thickness of the first adhesive layer and the thickness of the decorative film is the display device according to (10), which is 40 μm or less.
(12)
A display panel comprising a first polarizing plate bonded to the display surface side;
A decorative film having a first surface formed by a first direction and a second direction orthogonal to the first direction, and having an opening;
A translucent substrate for the cover;
A first adhesive layer that bonds the translucent substrate for cover and the first surface;
A second adhesive layer that bonds the surface of the decorative film side in the third direction orthogonal to the first surface of the transparent substrate for cover and the first polarizing plate;
The second surface which is the surface on the first polarizing plate side in the third direction of the decorative film covers an end of the first polarizing plate,
The sum of the thickness of the first adhesive layer and the thickness of the decorative film is 40 μm or less.

2 Panel 3 Light-shielding region 4 Display region 5 Display panel 6 Second polarizing plate 7 First polarizing plate 8 Phase difference film 9 Housing frame 10 Pixel substrate 10a Overhanging portion 11 Driver IC
DESCRIPTION OF SYMBOLS 12 Seal member 13 Liquid crystal layer 15 FPC board | substrate 20 Opposite board | substrate 30 Translucent substrate 30f Front surface 30r Back surface 32, 32a, 32b Decorating film 33 1st adhesive layer 34 2nd adhesive layer 35 Plate-like spacers 36, 64 38 third adhesive layer 39 backlight 40 outer peripheral surface 41 openings 42, 42a, 42b inner peripheral surface 421a first inner peripheral surface 422a second inner peripheral surface 423a third inner peripheral surface 44 upper surface 46, 46a lower surface 461a first lower surface 462a Second lower surface 463a Third lower surface 50 Control unit 60 Mounting table 60S Flat surface 62 Plate member 100 Display device w1, w2, w3 Width d1, d2, d3 Distance

Claims (11)

A decorative film adhering step for adhering the first surface of the decorative film having an opening to the translucent substrate for the cover;
A heat treatment step of heating the display panel including the first polarizing plate bonded to the display surface side;
After the heat treatment step, the second surface opposite to the first surface of the decorative film, which is bonded in the decorative film bonding step, covers the end of the first polarizing plate, A method for manufacturing a display device, comprising: a cover translucent substrate bonding step of bonding a cover translucent substrate and the first polarizing plate. The display panel includes a second polarizing plate bonded to a back side opposite to the display surface side,
The heat treatment step is performed in a state where an external force is applied to push the display surface side surface of the first polarizing plate of the display panel and the back surface side of the second polarizing plate toward each other. The method for manufacturing a display device according to claim 1.   The display according to claim 2, wherein the heat treatment step places the display panel on a flat surface and applies the external force by placing a plate member so as to cover the display surface of the display panel. Device manufacturing method.   The heat treatment step is performed in a state in which a protective film is provided on each of the display surface side surface of the first polarizing plate and the back surface side of the second polarizing plate. A method for manufacturing the display device according to 3.   In the heat treatment step, a plurality of the display panels arranged in a vertical direction, which is a direction in which gravity is applied, are placed on a flat surface, and a plate member is covered on the display surface of the display panel positioned on the uppermost side. The manufacturing method of the display device according to claim 2, wherein the external force is applied to the plurality of display panels by being placed in this manner.   In the heat treatment step, a plurality of the display panels arranged in a vertical direction, which is a direction in which gravity is applied, are placed on a flat surface, and a plate member is placed so as to cover the display surface of each display panel. The manufacturing method of the display device according to claim 2, wherein the external force is applied to the plurality of display panels by placing the external force on the display panel.   The heat treatment step is performed in a state in which a protective film is provided on each of the display surface side surfaces of the plurality of first polarizing plates and the back surface side of the plurality of second polarizing plates. A method for manufacturing a display device according to claim 5 or 6. A display panel comprising a first polarizing plate bonded to the display surface side;
A decorative film having a first surface formed by a first direction and a second direction orthogonal to the first direction, and having an opening;
A translucent substrate for the cover;
A first adhesive layer that bonds the translucent substrate for cover and the first surface;
A second adhesive layer that bonds the surface of the decorative film side in the third direction orthogonal to the first surface of the transparent substrate for cover and the first polarizing plate;
The second surface, which is the surface on the first polarizing plate side in the third direction of the decorative film, covers the end portion of the first polarizing plate, and a plurality of surfaces having different distances from the first surface Have
The said several surface is a display apparatus arrange | positioned in order with a short distance with a said 1st surface toward the direction which leaves | separates from the said opening part side of the said decorative film.   The display device according to claim 8, wherein a sum of a distance from the surface arranged closest to the opening to the first surface and a thickness of the first adhesive layer is 40 μm or less. A display panel comprising a first polarizing plate bonded to the display surface side;
A decorative film having a first surface formed by a first direction and a second direction orthogonal to the first direction, and having an opening;
A translucent substrate for the cover;
A first adhesive layer that bonds the translucent substrate for cover and the first surface;
A second adhesive layer that bonds the surface of the decorative film side in the third direction orthogonal to the first surface of the transparent substrate for cover and the first polarizing plate;
The second surface which is the surface on the first polarizing plate side in the third direction of the decorative film covers an end of the first polarizing plate,
The said decorative film is a display apparatus whose angle which the internal peripheral surface which is the side surface by the side of the said opening part and the said 1st surface make is an acute angle.   The display device according to claim 10, wherein the sum of the thickness of the first adhesive layer and the thickness of the decorative film is 40 μm or less.

Images